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To summarize: the 8 vs 12 selector only applies when charging at 120V. When charging at 208V or 240V (charging stations on 3-phase power supply 208V, not 230V), the car will charge at the available amperage advertised by the EVSE up to the car's maximum of 16A. This includes running the stock portable EVSE at 240V: the car will charge at 12A (the amperage the EVSE advertises) regardless of the 8A/12A setting.
 
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